/Engine/Source/Runtime/MovieScene/Public/EntitySystem/MovieSceneEntityFactory.h
This resolves all the parent-to-child relationships.
int32 ComputeChildComponents ( const [FComponentMask](API\Runtime\MovieScene\EntitySystem\FComponentMask) & ParentComponentMask, [FComponentMask](API\Runtime\MovieScene\EntitySystem\FComponentMask) & ChildComponentMask )